HKM-3724499 Retro Fat Tire E-Bike Runs a 1000W Peak Hub With 70 Nm on 16 x 4.0 Tires and Twin Air Shocks in Black

1000W peak · 750W rated · 70 Nm · air shocks · mechanical discs · 16 x 4.0 · 330 lb load · 98.1 lb

A Small Fat Bike With Air Shocks and a Seat Built for Two ErrandsRetro Lines and Late City Nights Out

A retro 16-inch fat bike with a 1000W peak hub rated at 750W, 70 Nm of torque and a 48V 15Ah pack worth 720Wh in the frame. Twin air shocks with 180 mm of travel at the rear, a sprung fork, mechanical discs and knobby 16 x 4.0 tires under a long bench. It weighs 98.1 lb, carries 330 lb, and it is listed at 51 miles. The frame wears a spider side panel in place of an engine cover, and the yellow flashes on the fork and chainstay are the only colour on an otherwise matte black machine.

The frame is a black loop with a spider-web side panel where a motorcycle would carry its engine cover, a long bench that runs over the rear wheel and a round headlamp with a cage grille on the fork crown. The bars are a high-rise bend, the pedals are platforms and the whole thing reads as a scaled-down scrambler rather than a bicycle.

What separates it from the cheaper 16-inch bikes is the rear suspension: two air shocks with adjustable damping and 180 mm of travel, not the short coil springs most of this class uses. That is what makes a 16-inch wheel rideable on gravel at speed, because the wheel can move instead of the rider absorbing everything.

At a Glance

• 1000W Peak Hub — Rated 750W, 70 Nm of torque
• 48V 15Ah Pack — 720Wh in the frame
• 51 Miles — Listed range
• Twin Air Shocks — 180 mm travel, adjustable damping
• Mechanical Discs — Front and rear
• 16 x 4.0 Tires — Knobby casing on spoked rims
• 98.1 lb — Heavy for the class but stable
• 330 lb Load — 150 kg rating
• Long Bench — Moped length, fixed
• Round Headlamp — Cage grille on the crown
• Spider Panel — Side plate in place of a cover
• Matte Black — With yellow fork and frame flashes

Retro Frame and Air Shocks

The frame is a black loop with a spider-web panel in the side, a bench that runs from the seat tube back over the rear wheel and a round headlamp with a cage grille sitting on the fork crown. High-rise bars, platform pedals and a rear rack behind the bench finish a machine that looks like a scaled-down scrambler.

The wheels are 16 x 4.0 knobbys on spoked rims, which is the smallest fat casing that still floats on gravel and snow. Spokes can be trued with a key after a hard landing, and the wide casing means you can run single-digit pressure on soft ground. Yellow flashes on the fork and the frame are the only colour.

The rear end runs two air shocks with 180 mm of travel and adjustable damping, which is a step above the coil springs on most 16-inch bikes: you set the pressure for your weight and the damping for the surface. The fork is a sprung unit up front and the brakes are mechanical cable discs at both ends.

• Frame: black loop with a spider side panel
• Battery: 48V 15Ah, in the frame
• Wheels: 16 in spoked, 4.0 knobby
• Fork: sprung, single crown
• Rear: twin air shocks, 180 mm travel
• Brakes: mechanical cable disc

Fitted as shipped: the caged headlamp, front and rear fenders, a rear rack behind the bench, the side panel, a kickstand and the pedals. The bars carry the throttle, the assist switch and the brake levers, and the charge port sits on the side of the frame where it can be reached with the bike on its stand.

1000W Peak and 720Wh

The motor is a rear hub rated 750W continuous with a 1000W peak and 70 Nm of torque, which on a 16-inch wheel with 98.1 lb behind it is enough to pull away cleanly and climb a loose slope. The listed range is 51 miles at low assist, and the throttle and the pedals both work, so a flat battery does not mean a push.

The pack is 48V 15Ah, 720Wh, and it sits inside the frame where the weight is lowest. Charging is through the port on the frame, so the bike stays where it is parked rather than the battery coming indoors. Plan on an overnight charge, and keep the port dry between rides.

Two numbers to compare when you shop this against a 20-inch bike: the motor is quoted at a 750W rating with a 1000W peak, and the bike carries 330 lb rather than the 264 lb most 16-inch builds allow. That is why it weighs 98.1 lb, and it is the honest trade for a small bike that an adult can actually ride.

Who It Fits and How It Rides

The bench is low and the bars are high, so a shorter rider gets both feet down; the length of the seat also means a taller rider can slide back rather than feel cramped. The 330 lb rating covers an adult with a pack, and at 98.1 lb the bike is stable at speed in a way the lighter 16-inch builds are not.

On gravel, grass and snow the air shocks do the work and the fat casing floats, and the mechanical discs are adequate if you pull both levers. On pavement it is heavy and the knobbys hum, and it is a two-handed lift onto a rack. It is at its best on a campground loop, a fire road or a beach path.

• Campground loops and fire roads
• Gravel, grass and snow
• An adult sized 16-inch bike
• Not for long road rides or stairs

What's in the Box

Before the first ride: fit the front wheel and torque the axle, set the bars square to the fork, set the air shock pressure and damping for your weight, bed the cable discs in with ten firm stops and charge the pack. Budget 40 to 60 minutes, and check the brake cables and axle nuts after the first ten miles.

Color and Finish

Matte black covers the frame, panel, fenders, bench, rack, fork and rims, with yellow flashes on the fork legs and a yellow stripe along the chainstay. The headlamp bezel and the springs are black, so the yellow is the only colour on the bike.

Touch-up paint in matte black is available on request. The wear points are the side panel where a knee rubs it, the rack edges and the fork lowers where roost hits them.

Battery Care and Maintenance

Charge between 20 and 90 percent for everyday use and take it to full about once a month. The pack lives in the frame, so charge it where the bike is stored and keep that spot above freezing. If the bike will sit for a month, leave it around half charge and top it up every few weeks.

The air shocks need attention the coil springs do not: check the pressure monthly with the pump supplied and set it for the rider's weight. Check tire pressure before every ride, the spokes and axle nuts after the first 50 miles, and the brake pads monthly. Keep the chain oiled and wipe the fork legs after a wet ride.

Specifications

Frequently Asked Questions

Service and Policies

Coverage that lasts beyond the box. Orders ship free with a tracking number in 2 to 5 business days. From delivery, the product is protected for 180 days against manufacturing defects and transit damage, returnable within 30 days for a full refund, and covered by a 24-month parts-and-labor warranty on manufacturing defects. Four policies, one idea: ship it free, protect it for 180 days, take it back for 30, and stand behind it for two years.

HKM-3724499 · retro 16 inch fat tire electric bike · rear hub rated 750W with a 1000W peak and 70 Nm · 48V 15Ah 720Wh pack in the frame · 51 miles listed range · mechanical cable disc brakes front and rear · sprung fork with twin air shocks at the rear, 180 mm travel and adjustable damping · 16 x 4.0 knobby tires on spoked rims · long bench seat with a spider side panel · caged round headlamp, rear rack and fenders · 98.1 lb with a 330 lb load rating · matte black with yellow flashes · charger in the box · UL listed · built for campgrounds, fire roads and gravel rather than long road rides · twin air shocks need a pressure check before the season and after any change of rider